content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import io.reactivex.common.Disposable;
  import io.reactivex.common.internal.disposables.DisposableHelper;
  import io.reactivex.observable.*;
  
  /**
   * Signals true if the source Maybe signals onComplete, signals false if the source Maybe
   * signals onSuccess.
   * 
   * @param <T> the value type
   */
  public final class MaybeIsEmpty<T> extends AbstractMaybeWithUpstream<T, Boolean> {
  
      public MaybeIsEmpty(MaybeSource<T> source) {
          super(source);
      }
  
      @Override
      protected void subscribeActual(MaybeObserver<? super Boolean> observer) {
          source.subscribe(new IsEmptyMaybeObserver<T>(observer));
      }
  
      static final class IsEmptyMaybeObserver<T>
      implements MaybeObserver<T>, Disposable {
  
          final MaybeObserver<? super Boolean> actual;
  
          Disposable d;
  
          IsEmptyMaybeObserver(MaybeObserver<? super Boolean> actual) {
              this.actual = actual;
          }
  
          @Override
          public void dispose() {
              d.dispose();
          }
  
          @Override
          public boolean isDisposed() {
              return d.isDisposed();
          }
  
          @Override
          public void onSubscribe(Disposable d) {
              if (DisposableHelper.validate(this.d, d)) {
                  this.d = d;
  
                  actual.onSubscribe(this);
              }
          }
  
          @Override
          public void onSuccess(T value) {
              actual.onSuccess(false);
          }
  
          @Override
          public void onError(Throwable e) {
              actual.onError(e);
          }
  
          @Override
          public void onComplete() {
              actual.onSuccess(true);
          }
      }
  }
  